11991126017 has 8 divisors (see below), whose sum is σ = 13058617320. Its totient is φ = 10944362880.

The previous prime is 11991126013. The next prime is 11991126041. The reversal of 11991126017 is 71062119911.

It is a Cunningham number, because it is equal to 109504²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 11991126016 = 1^2 + 109504^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11991126017 - 2² = 11991126013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11991126013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5180834 + ... + 5183147.

It is an arithmetic number, because the mean of its divisors is an integer number (1632327165).

Almost surely, 2^11991126017 is an apocalyptic number.

It is an amenable number.

11991126017 is a deficient number, since it is larger than the sum of its proper divisors (1067491303).

11991126017 is a wasteful number, since it uses less digits than its factorization.

11991126017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364083.

The product of its (nonzero) digits is 6804, while the sum is 38.

The spelling of 11991126017 in words is "eleven billion, nine hundred ninety-one million, one hundred twenty-six thousand, seventeen".